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Fair PSF estimates what recent prices would look like after adjusting for remaining lease, so older-lease and newer-lease flats can be compared on a more consistent basis.

For HDB reports, the app first looks for at least 20 local near-99-year resale transactions. If there are not enough, it uses at least 20 local transactions with the longest remaining leases and converts their PSF back to a 99-year-equivalent proxy. It then applies: Fair PSF = baseline PSF × (remaining lease / 99)^k, with k = 0.6 by default.

For private condos, the app first looks for at least 20 local freehold or 999-year resale/sub-sale benchmark records for the selected geography. If that local benchmark is too thin, it can use at least 20 local leasehold records with the longest known remaining leases and convert their PSF back to a 99-year-equivalent proxy. It does not use a broader national proxy for the Fair PSF baseline.

If actual PSF is below Fair PSF, the unit or estate may look better value on a tenure-adjusted basis. It is still not a valuation, because it does not adjust for floor, facing, renovation, block condition, exact location, or buyer preference.